Armature support



. Jan. 16, 1940. J. WHITE ARMATURE SUPPORT Filed March 4, 1957 Patented Jan. 16, 1940 UNITED STATES PATENT OFFICE ARMATURE sorron'r tion oi Delaware Application March 4, 1937, Serial No. 128,923

3 Claims.

This invention relates to sound signal devices of the vibratory type, and has for an object to improve supporting means for an armature in a v vibration motor.

1 the compression chamber on the working side of the diaphragm. In a construction of that character, having armature adjusting means, it has heretofore been necessary to provide a port through the casing or collar opposite the armature stud,'by which adjustment of the air gap and armature spacing could be accomplished. It has also been necessary to provide a. plug or other sealing means to close the port. It is therefore anobject of this invention to provide armature adjusting means that will be readily accessible I from the" motor side of the diaphragm, whereby full adjustment of the armature and its air gap can be accomplished without disturbing the seal of the air column, and without disturbing the conneotion of the armature rod and the diaphragm.

In constructions of the aforementioned prior art devices, when making armature adjustments, it has been necessary to first remove the plug, make such adjustment as was deemed sufiicient, replace the plug, and then sound the horn. If the adjustment was not correct then it was necessary to remove the plug, repeat the adjustment, and again replace the plug, before a second trial of the adjusted horn could be made. It was necessary to replace the plug each time before sounding the instrument, in order to restore the horn to actual; conditions of use, so as to determine the correctness of the adjustment. It is therefore an object of Lthis invention to provide means for armature adjusting means, that in no way disturb or interfere with the parts contributing to the definition of the air column.

These' several objects have been accomplished by fashioning the armature with a centrally disposed semi-spherical like socketed aperture, and

supporting it by a sleeve threaded upon the armature rod, the sleeve having a ball-like shoulder or flange for reception of the armature socket, and

. by providing an adjusting plate with non-rounded provisions engaging the sleeve, by which the sleeve may be turned 'upon the threaded stud. Any convenient cooperating means, as a lock nut, may be used for clamping the parts in adjusted position.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawing wherein a preferred embodiment of the present invention is clearly shown.

In the drawing:

Fig. 1 is a top plan view of a sound signal device with the cover assembly removed, substantially as indicated by arrow I in Fig. 2.

Fig. 2 is a vertical section through the sound signal device, substantially as indicated by the line and arrows 22 of Fig. 1.

Fig. 3 is an enlarged detail view in section, illustrating the armature supporting and adjusting means.

Fig. 4 is an enlarged detail view with parts shown in section, substantially as indicated by the line and arrows 44 of Fig. 2.

Referring particularly to the drawing, indicates a collar member cooperating with a cap l2 providing a normally closed air column l4, one end of which opens into a compression chamber l6 closed off by a diaphragm I8 clamped to the collar member ID by a motor base and screws 22.

Rigidly mounted upon the motor base 20in any convenient manner, as by means of brackets 24, there is a magnet frame 26, notched at 28 to carry a magnet winding 30. The magnet frame is centrally apertured at 32 to allow for reciprocatory passage of an armature rod 34, rigidly connected to the diaphragm I8 byclamp washers 36, one of which engages a shoulder 31, and nut 38. The opposite end of the armature stud 34 is threaded at 40, receiving means later to be described for supporting an armature, and receiving means for actuating a circuit breaker 42. A bracket 44 is secured to the motor base 20, and supports one end of a spring 46 that guides the armature and its assembly, and also provides means for supporting the circuit breaker 42, all as is well known to those experienced in the art. Briefly, rivets 48 passed through sufiicient insulators, and the circuit breaker mechanism, with spacers 50, and secure them to the bracket 44.

The armature spring 45 is apertured at its end to embrace thethreaded end of the armature rod, and is engaged on opposite sides by washers 52 and 56. One leaf 58 of the circuit breaker 42 extends in such close proximity to the threaded end 40 of the armature rod, as to be engaged by y a spherical recess 68 and a rounded shoulder Hi disposed about an aperture 72 somewhat larger than the cross-section of the threaded stud. Threadedupon the portion Ml of the stud there is a sleeve 74, that has a spherical shoulder it upon which the recessed portion 68 of the armature might be adopted, all coming within the scope of the claims which follow.

rests, and is capable of oscillation. For this purpose the reduced portion of the sleeve 14* is'sorner what smaller in cross section than is the aperture 12 of the armature, and for'that portion of the sleeve extending through the armature there is provided a flat i8 that matches with a rib Bil Fig. 4, extending across the edge ofacentral-bore 82 of an adjusting plate M, that in turn is re- K cessed in a spherical sense on one side at 'iifi'about' its aperture soas t0 fit the rounded portion ill of thearmature.

' In the order of assembly, the sleeve 54 is threaded upon the portion 46 of the stud, and is "followed by the armature 64, such that the re cess portion 68 rests upon the shoulder iii.

Thence follows the adjusting plate 85 that is:

passedover, the end ofthe sleeve i i so that the rib 80 coincides with the flat or non-rounded portion 78 of the sleeve. Now comes the washer 56, the apertured end of the armature spring 36 and the second clamping washer 52,-all of which are held in place when the proper adjustment is made, bya clamp nut 88 threaded upon the portion of the stud.

With a device so constructed, adjustment of the armature upon; the rod 34 is accomplished, if

need be, by looseningthe nut 38, and thence Q turning the adjusting plate 84. Turning the'adjusting plate 84' upon the threaded stud it, will also turn the sleeve} 14: upon the threaded stud, and within the armature M, and in so doing carrying the armature 64 along the threaded stud in the direction of movement of the adjusting plate 84. Upon completing the adjustment,

cover 90 is replaced, and the holding screw 92 passed therethrough and threaded into theyoke .94 as is illustrated. A convenient way to support the yoke 94, and further accomplish accessibility to the armature adjustment, is to provideoppositely disposed notches at each end of the yoke so that when the ends of the yoke are passed through apertures 96 of the the motor base, the notches will engage the shoulders 98,

and provide sufiicient anchorage for the storm j While the embodiment c the present invention as herein disclosed, constitutes a preferred form, it is to beunderstoocl that other forms diaphragm, and a magnet frame in superposed the adjustment when accomplished, said nutbje- I ing accessible only from the armature side oft he, frame. I I e 2. In an armature support for a magnet-motor,

the combination comprising, an armature stud,

a shouldered sleeve having a non-circularportion and being threaded-upon the stud, an armature, a universal seat for the armature upon thesleeve shoulder, an -adjusting. 'platesurrounding, one end of the sleeve and engaging the armature, said plate-having non-circular provisions engagiing the sleeve for altering the threadedrelation of the sleeve and stud, and a clamp nut adapted to restrain relative movement between the sleeve andstud. I r

3; In an armature support fora magnet motor,

thecombination comprising, an armature stud, a sleeve providing a shoulder and having a screw threaded relation with the stud, an armaturev having an extrusion for seating on the sleeve 

